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Seebeck coefficient

Submitted by ztadmin on Fri, 2000-06-09 11:43

Dear Friends,
Many of us require the Seebeck coefficient for different
elements
and compounds (various range of tempeatures). I would like to make a common
table of all possible elements. let us try to post the same in this site,
which may be updated when ever we receive a new set of vaues. Please kindly
send the possible data for any common and frequently required material
which
is available with you.

----kmskumar----

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‹ Re[2] Seebeck coefficient Re Re[2] Seebeck coefficient ›
»

RE Seebeck coefficient

Submitted by Anonymous on Sat, 2000-06-10 09:04.

Dear Mr Kumar,

R. Wallace Stewart (Ref.1) gives the following expression for the thermoelectric powers of metals

dE/dT = a + 2b*T

where,

E = electromotive force
T = temperature
a,b = constants

This expression implies that thermoelectric power (dE/dT) varies linearly with temperature.

Based on experimental results by Dewar and Fleming, the constants a and 2b which give the thermoelectric powers of the metallic elements mercury, silver and tin in units of microvolts per degree centigrade are quoted respectively as

Hg a = -4.460; 2b = -0.00860
Ag a = 2.960; 2b = 0.00714
Sn a = 0.047; 2b = 0.00021

Therefore the thermoelectric powers of these metals at temperatures of 0'C and 100'C respectively are given as

Hg -4.460E-6 V/'C; -5.320E-6 V/'C
Ag 2.960E-6 V/'C; 3.674E-6 V/'C
Sn 0.047E-6 V/'C; 0.068E-6 V/'C

I think it would be interesting to find out if modern methods of measurement have produced any significant improvements on the accuracy of these figures.

Best regards,

Keith P Walsh

Ref.1 'The Higher Text-Book of Magnetism & Electricity', University Tutorial Press Ltd., London, 1906.

PS, I have assumed that the terms "thermoelectric power" and "Seebeck coefficient" are recognised as being equivalent in this context.